How to Soundproof a Hollow Door (12 Easy and Effective Ways)

You may notice that your hollow door is making a lot of noise and letting in a lot of outside sounds. This can pose a problem especially when you are trying to relax in your living room after a long day. However, instead of trashing out that door and replacing it with a solid wood door, take some time to soundproof it yourself.

How to soundproof a Hollow Door? Install rubber door sweeps, and fiberglass quilted panels to prevent noise from passing through the door. Adding mass to the hollow door with Mass Loaded Vinyl will also help prevent noises from outside. Place a thick rug on either side of the door to reduce footstep noises.

In this article, I’ll show you how to soundproof a hollow door so that you can finally enjoy your home without having to hear every little noise that comes through that hollow-core door.

How to Soundproof a Hollow Door? 

How to Soundproof a Hollow Door? 

The most common way to soundproof a hollow door is by installing additional insulation. This will help block any sound from entering or exiting the room, which can be especially helpful if you live in an apartment building or have thin walls.

If you’re not interested in adding more insulation and just want to make some simple changes so your hollow door doesn’t make as much noise, here are some other ways that you can try:

1. Weatherstrip the Door

Weatherstrip the Door

When you’re trying to soundproof a hollow door, the first thing you want to do is weatherstrip the door. If your door has a hollow core, this is a great way to reduce noise from the outside coming into your home.

Weatherstripping helps keep air and sound from escaping or entering through the cracks around doors. 

In addition to keeping noise out, weatherstripping can also help conserve energy by reducing the amount of air that is lost through cracks and crevices in the building.

How to Weatherstrip a Hollow Door

Here is a step-by-step guide to weatherstrip your door:

Step 1. Measure the door:

Measure the length and height of your hollow core door. For more accurate measurements, use a measuring tape and measure from the top of the frame to the bottom of the frame, and from one side of the frame to another. Write down these measurements.

Step 2. Cut weather strip to size:

Use a utility knife to cut your weatherstripping material to size by cutting it into strips that are 1″ longer than your measurement from “step 1”. 

The extra inch will help you wrap it around the door without overlapping onto itself or creating gaps between its edges and those of your doorframe.

Step 3. Wrap weatherstripping around the edges of your doorframe:

Once you’ve cut your weatherstripping, put it around each side of your doorframe so that it adheres to both surfaces with no gaps in between them. 

2. Install Mass Loaded Vinyl (MLV) 

Install Mass Loaded Vinyl (MLV) 

Mass Loaded Vinyl (MLV) Barriers are made from sheets of flexible, resilient vinyl loaded with carbon granules. 

These sheets are attached to each other and then applied over the surface area of the door. The result is an extremely effective barrier that can help cut down on reverberation and other types of noise pollution.

These are also known as MLV panels or sound absorption sheets. They are very easy to install and they come in many different sizes so they will fit any hollow door. The best part is that they don’t require any tools or special skills.

Steps to Install Mass Loaded Vinyl on a Hollow core door

Step 1. Measure the length of your door frame and cut a piece of mass loaded vinyl (MLV) to the same size, allowing at least an inch on each side for overlap.

Step 2. Apply adhesive to the back of the MLV and stick it to the door frame using a roller. Make sure you don’t skip any spots. You want it nice and smooth so that there are no air gaps between your MLV and your door frame when you’re done.

Note: Although it might not look so good on the door, it will definitely block noise from the outside.

3. Install Acoustic Panels or Acoustic Foam

Install Acoustic Panels or Acoustic Foam

Acoustic paneling is an excellent option for soundproofing a hollow door. These panels are made of materials that absorb sound rather than reflect it. Acoustic panels come in many different types and sizes, so it’s easy to find one that fits your needs exactly. 

The only drawback of installing acoustic panels or foam on a door (if not inside it) is that it usually doesn’t look very nice on the door. If you’re concerned about the aesthetics of your door or living space then you may want to try another method.

Acoustic Panels

Acoustic panels are usually made of wood fibers, glass fibers, mineral wool or rock wool. The panels are designed to absorb sound instead of reflecting it back into the room where it originated. 

This means that they will reduce the amount of noise that reaches your ears after bouncing off of solid surfaces like walls or floors.

Acoustic Foam

Acoustic foam is another option for quieting your hollow doors because it works by absorbing sound waves rather than reflecting them back into the room where they originated from. 

There are two types of acoustic foam. Polyurethane foam and polyester foam (also called polyethylene foam). 

Polyurethane foam is more effective at blocking high frequencies while polyester foam works better at blocking low frequencies.

4. Use Door Perimeter Seal

Use Door Perimeter Seal

A door perimeter seal is an effective way to reduce noise from outside. These seals are usually made of rubber, silicone or aluminum. 

They work by creating a tight seal around the opening of your hollow door so that air cannot pass through it easily. This also prevents outside noises from entering through the gaps in your door frame. 

You can add a perimeter seal around the edges of the door using duct tape or mastic-based sealant. This will block off any gaps between the door and the frame. The best sealant for this job is mastic-based sealant because it has better adhesion than duct tape does.

How to Install Perimeter Seal to a Hollow Door for Soundproofing

Step 1. Remove the doorstop and doorstop bracket from the door frame.

Step 2. Measure and cut a length of perimeter seal to fit around the perimeter of your hollow-core interior door.

Step 3. Apply adhesive to the back of the perimeter seal and press it into place on all four sides around the door until it is seated firmly.

5. Install Door Gasket

Install Door Gasket

Door gasket is a soundproofing material for hollow doors. You can install a door gasket to help reduce noise from the other side of the door. Door gaskets come in different sizes and materials. 

If you have a hollow door, choose a thinner gasket that will compress when you close the door, rather than a thicker one that will make it harder to close.

The door gasket is a simple, inexpensive way to make your door more soundproof. It’s quick to install, and it can be removed at any time.

How to Install Door gasket 

Step 1. Remove the old gasket (if any) from the door and discard it.

Step 2. Clean the door with a damp cloth to remove any dirt or debris from the surface of the door. This will help the new gasket adhere to the surface of the door.

Step 3. Apply a thin layer of silicone caulk to all four sides of the door jamb and let dry for at least 30 minutes before installing your new gasket.

Step 4. Place your new gasket over top of your door jamb, making sure that it is flush with all sides of the jamb and that there are no gaps in between where it meets up with itself (this will cause leaks).

6. Fiberglass Quilt Panel (Acoustic Panels Alternative)

The fiberglass quilt panel is a great way to soundproof a hollow door. It is easy to install and can be used for any door in your house. The fiberglass quilt panel is made up of two pieces of fiberglass that are sandwiched between two pieces of vinyl.

They are usually 2 inches thick and come in a variety of colors and textures so you can match them with your room’s decor.

The fiberglass quilt panel works by absorbing both high frequency noise and low frequency noise. 

High frequency noise, like the sound of running water or a dog barking, will be absorbed by the fiberglass while low frequency noises like slamming doors or people walking through your house will also be absorbed by the fiberglass quilt panel.

7. Hang drapes or Soundproof Curtains

Hang drapes or Soundproof Curtains

Hanging drapes or soundproof curtains in front of the hollow door is one of the easiest ways to reduce noise coming in from outside.

Drapes and curtains work great as soundproofing because they’re soft and flexible. They can also add a nice touch to any room, which makes them perfect for any room in your home. 

If you’ve got a door that lets in too much noise, one way to fix it is by hanging some drapes or curtains behind the door. If you don’t have any drapes or curtains lying around, you can buy them at most stores for cheap.

Drapes

Drapes are great for covering up the space around a door without blocking out sound completely. They work well in conjunction with other soundproofing solutions, like acoustic panels or thicker doors. 

Drapes reduce noise by absorbing it as it passes through them; this makes them an ideal choice if you’re looking to create a cozy atmosphere while still keeping some noise in check.

Soundproof Curtains

Soundproof curtains are designed specifically for blocking out all kinds of noise, including the sounds of doors opening and closing. 

They work best when used on their own because they provide a flat surface that is easy to seal off from outside sources of sound pollution (like traffic). 

You can also use them in conjunction with other forms of soundproofing materials such as acoustic panels or carpeting if needed.

8. Install a Door Sweep

A door sweep is a small piece of material that is installed under the bottom of a door to prevent air and noise from passing through. The most common type of door sweep is made from foam, but there are also rubber and cork versions available.

Installing a door sweep is an easy, inexpensive way to reduce the amount of sound that passes through a hollow-core door. The sweep fits around the bottom of your door and seals against the floor.

There are different types of door sweeps to choose from:

Felt Strips

A felt strip is a good choice if you’re trying to control sound coming into a room, but not necessarily keep it out. It’s great for keeping sound out of a room where you don’t want it, but not so good at keeping sound in.

Foam Rubber Door Sweep

A foam rubber sweep is great for soundproofing wooden doors, or doors that have been converted to solid core wood. 

This is because foam rubber will compress and expand when the temperature changes, which helps it resist the pressure of sound waves hitting against the door frame.

Aluminum Door sweep

An extruded aluminum sweep is best if you want something that will last longer than felt strips or foam rubber sweeps (and won’t be damaged as easily). They’re also lighter than other types of sweeps and can be installed without any additional tools needed.

How to Install Door Sweep on a Hollow Core Door

The installation process is really simple.

Step 1. Start by removing the door from the hinges.

Step 2. Remove the old sweep (if any) and clean the area where it was attached to the door.

Step 3. Attach the new sweep with screws that match the length of your hollow door. 

Step 4. Rehang your door on its hinges, and you’re all set.

9. Use a Door Rug

Use a Door Rug

Door rugs are a great way to soundproof your hollow door. They provide a cushion that absorbs the sound of footsteps and closes the gap between the door and its frame.

The best types of door rugs are ones that are thick, like carpeting, because they can absorb more sound than thinner rugs. The thicker the rug, the better it will be at canceling out noise.

Quick Tip: To get the most benefit from your rug, place it on both sides of the door.

There are many different types of rugs made from different materials. Following are some that are best for soundproofing hollow core doors.

1. Foam Door Mats

Foam door rugs are good at muffling sound and providing insulation. They are also very inexpensive, making them a great option for those who want to minimize their costs while still getting the benefits of using a door rug. 

Foam does not last very long, however, so you will have to replace it every few years (or sooner if it gets damaged).

2. Rubber Door Mats

Rubber door mats are the best at absorbing sound, which makes them great for use in any room where you have hollow doors or walls that let noise through. 

They provide insulation and muffling as well as being easy to install and remove from your door when needed. 

Rubber door rugs are also durable enough to last for many years without needing replacement or repair.

3. Cork Door Mats

Cork is another great material for door rugs that help with soundproofing hollow doors. Cork is very durable and resilient, so it will last for several years before needing replacement or repair. Cork is also eco-friendly because it comes from a renewable resource: trees.

10. Fill with Insulation Foam

Fill with Insulation Foam

Insulation foam is a lightweight and malleable material that can be applied to any surface, including doors.

Insulation foam works by creating a barrier between two surfaces that allows air to move through but prevents sound waves from traveling through. 

This means that if you install insulation foam inside of your hollow door, it will block any sound coming through the door from entering into your home or apartment.

Installing foam insulation in a hollow-core door can be tricky. If you’re not experienced with do-it-yourself projects, consider hiring a professional to do the job.

How to Fill Insulation Foam in a Hollow Core Door

Tools and Materials Needed for Soundproofing

In orderFollow all the steps carefully:

To get started, you’ll need:

  • A utility knife.
  • A can of expanding foam insulation.
  • A drill with a bit that matches the diameter of your foam nozzle. The most common diameter is 1/2 inch (12 mm).

Step 1. Gather at least two cans of expanding foam insulation

Take off the door and lay it on two sawhorses. You’ll need to gather at least two cans of expanding foam insulation. 

This is the best type of spray foam for soundproofing a hollow door, and if you want a strong seal it’s important that the foam be “spray foam” rather than standard expanding foam.

Step 2. Drill holes in the door

Drill holes in a few hidden places on the door. The hole should be small enough to fill with foam.

The best place for the hole would be at the bottom of the door, but you should also check if there are any other areas where you can add a few extra holes that will not be visible.

Step 3. Fill each of the holes with expanding insulation foam

Next, fill each of the holes with expanding insulation foam. Spray until you feel that you have a nice, smooth layer of insulation foam over the entire inside of your door.

Step 4. Cut away any excess foam

Use a utility knife to cut away any excess foam that drips from the door. Do this step when the foam is still wet and can be cut with a knife. If you wait too long, the foam will dry and be more difficult to cut.

Step 5. Flat the door surface

Use the flat surface of a utility knife to smooth out any expanding foam on the door surface. This will help reduce any imperfections made while cutting away excess foam.

11. Apply Sound Absorbing Paint

Apply Sound Absorbing Paint

Sound absorbing paints are designed to reduce the transmission of sound waves through materials such as wood and concrete by absorbing some of those waves before they travel through them. 

You can apply these paints directly on hollow doors without sanding or priming first, although it may take several coats before you achieve maximum absorption effects.

12. Replace a Hollow Core Door with a Solid Door

Replace a Hollow Core Door with a Solid Door

Solid wood doors are much better at blocking sound because they have no hollow parts, so they’re less effective at transmitting noise from one room to another. 

If you need to replace your existing doors, look for ones made from solid wood or solid composite materials like fiberglass and vinyl-coated MDF (medium density fiberboard). 

These products cost more than hollow core doors but will help block sound better than their hollow counterparts.

What Is Inside a Hollow-Core Door?

A hollow-core door is a kind of door that has a hollow center, made of MDF or plywood. The center is filled with insulation, which helps to keep the heat in your home and make it more energy-efficient.

Hollow-core doors are typically used for interior doors and closet doors, but you can also find them in prefabricated shower stalls. They’re made from several pieces of wood that are joined together with screws or nails.

Hollow-core doors are usually white or light colors to match the walls around them, but they come in other colors too. Some manufacturers offer custom colors for their hollow-core doors, so you can get exactly what you want without having to paint them yourself.

Benefits of soundproofing a Hollow Door

Following are the benefits of soundproofing a hollow door, as well as provide some tips on how to do it effectively.

Improved Privacy

One of the primary benefits of soundproofing a hollow door is improved privacy. If you live in a busy household or have noisy neighbors, a soundproofed door can help create a more peaceful environment. With a soundproofed door, you can work, sleep, or relax without worrying about being disturbed by outside noise.

Better Acoustics

Soundproofing a hollow door can also improve the acoustics of a room. If you are a musician or enjoy watching movies with surround sound, a soundproofed door can help keep the sound contained within the room. This can result in a more enjoyable listening or viewing experience for you and your guests.

Energy Efficiency

Soundproofing a hollow door can also help with energy efficiency. A door with gaps or leaks can allow air to escape, resulting in higher heating or cooling costs. Soundproofing the door can help reduce these gaps, resulting in lower energy bills and a more comfortable indoor environment.

Easy Installation

Soundproofing a hollow door is a relatively easy and inexpensive DIY project. There are a variety of soundproofing materials available on the market, including weatherstripping, soundproofing foam, and acoustic panels. These materials can be easily installed on a hollow door with minimal tools and expertise.

Conclusion

You can soundproof a hollow door by adding foam insulation inside the door. Sealing the edges of your hollow door with weather stripping will also help keep out outdoor noise. Consider using Mass Loaded Vinyl to add mass to the door for greater soundproofing.

Having a hollow door is not the best option when it comes to sound control. If you can’t replace your hollow door, then there are many options that you can do to soundproof your existing one. 

Soundproofing a hollow door can provide a variety of benefits, including improved privacy, better acoustics, energy efficiency, and easy installation. If you are looking to create a more peaceful and enjoyable indoor environment, soundproofing a hollow door may be a simple and effective solution.

Frequently Asked Questions (Soundproof a Hollow Door)

Can I fill a hollow door with foam?

Yes, you can fill a hollow door with foam. Hollow doors are doors that have large gaps between the frame and the door itself. The foam will fill these gaps, which will make the door more soundproof and prevent the outside noise from passing through.

Can you soundproof the inside of a door?

Yes, you can soundproof the inside of a door using insulation foam. If you want to reduce noise coming into your home, you can fill the insulation foam inside your door. The foam will absorb sound and deaden it, so you don’t hear as much outside noise.

What is the cheapest way to soundproof a door?

The cheapest way to soundproof a door is to weatherstrip and install a door sweep. Weatherstripping a door will help reduce sound transfer between rooms. A door sweep is a piece of rubber that attaches to the bottom of the door and helps seal in sound between rooms.

Do hollow core doors block sound?

The hollow core doors do not block sound. In fact, they are designed to transmit sound through them because they have small gaps between the panels. Additionally, hollow-core doors are not as thick as solid wood doors so they don’t provide much sound dampening for your room.

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Brendan Ratliff
Brendan Ratliff

As a soundproofing and acoustical professional, I have helped new homeowners, builders and remodelers with their projects. I also help contractors/designers learn how to properly install soundproofing in their clients homes.
I enjoy helping people understand the process of soundproofing and acoustical construction. SoundproofProfessional.com is a one-stop solution for all of your soundproofing related questions.